What kind of doubling is this?

[DWK]

I suppose this is some sort of strike doubling, as opposed to deterioration or abrasion. It almost looks like it bounced 3 times.

Pleasse advise. Thanks

DWK

[hasfam]

Yep...strike doubling or mechanical doubling.
If you didn't get a chance to check out Jason's thread on the subject, here is a link (http://www.lincolncentresource.net/forums/showthread.php?t=6528&highlight=mechanical+doubling) to it.
Thanks,
Rock